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Thanks for this information.
I may be looking for a solution to a problem that I may not have. I am scheduled to receive my Qutest, Monday.
I have done a search on this forum and didn't see any posts about the iFi iPower 5 volt DC PS as a good $50 option. John Darko mentioned it in his Qutest review.
I have compared the stock with poweradd 2 power bank, no different to me.
Till now,almost a year, still using the stock.
Maybe I will try 485w power banks for both the Qutest and HMS one
of these days.
Most players like foobar state the samplerate theyre outputting in properties
Did you checked this first?
Yes Foobar is showing 192KHz in the bottom left corner and this is confirmed by the same rate showing on the screen of the Topping D10. Foobar doesn't throw up an error message, it just plays the track silently. I'm getting more convinced that it is a fault with the QED cable.
I had the same with optical out of my AK120 DAP, only the 3rd cable i tried worked up till 192khz. After research i found that the best optical cables are the multistranded ones. It has to do with light reflections.
The smaller the diameter, the less timing differences occur at the cable end. Each strand is much thinner than a one solid cable, but theyre pricey.
I have settled with a 0.75m Audioquest Forest for€25.
That's interesting. I read an article in HiFi Choice about digital cable quality. Reflections in optical cables was mentioned.
It's odd though that I have a £5 cable that works fine with 192KHz. I tried to find out where I bought it. It was either Amazon or Ebay but I can't find a purchase on either. I am thinking it was Ebay and my Ebay purchase history doesn't go back more than two years.
Reflections are random, also the polish accuracy of the connector surface plays a role. Im just saying that 192khz is the edge of capabillity for a single strand cable. I guess your Qutest could be processing lost/double bit errors that you won't hear easily but just dont drop out.
Mine is QED Reference Optical Quartz at £88 for 1 metre and like you suggest and I'm quoting here from QED's website:- it is made consisting of 210 separate boro-silicate glass fibres each finer than a human hair. It has a much higher bandwidth and only 1/10th of the attenuation of traditional acrylic fibres. Reference Optical Quartz vastly exceeds the demands for high definition multi-channel digital audio with a bandwidth of over 150MHz which is totally unaffected by bending the cable.
I dont think there is any free lunch with regards to an external PS, I doubt a $50 supply will be noticeable.
Hm have you peeked into the optical hole of Qutest and your source.. maybe theres dust / moisture in it. That would be devastating.
And on foobar you use wasapi?
Windows mixer can downsample f2k's 192khz output..
As an owner of the iFi power supply, they are garbage. The DC output is filtered but they have excessive leakage current. Might even sound worse than the stock supply. Qutest does perform better with a good supply, but good will cost you many hundreds of dollars. But expensive doesn’t mean better either. You will need to audition many supplies before you find one that is clearly better.
I’m also running an IFI ipower with my qutest, and i am definitely sure it is not garbage. I am separating the ipower from the rest of the component in the power strip using an ac ipurifier (plugging the ipower at the end of the power strip, with the ac ipurifier in front if it). Definite improvement compared to the stock smps, more separation, more air. Will there be more/bigger improvement using better/more expensive psu in the market? Yes. Is it worth it?